<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title></title>
  </head>
  <body>
    <div id="app">
      <div :style="[baseStyles, overridingStyles]">11111111</div>
    </div>

    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
    <script>
      const { createApp, reactive } = Vue;

      createApp({
        setup() {
          const baseStyles = reactive({
            color: "red",
            fontSize: "13px",
          });

          const overridingStyles = reactive({
            color: "green",
            backgroundColor: "red",
          });

          return {
            baseStyles,
            overridingStyles,
          };
        },
      }).mount("#app");
    </script>
  </body>
</html>
